The metamorphic rocks to be examined on the field excursion have been assigned to the Tapanappa Formation (Early Cambrian Kanmantoo Group), a generally monotonous sequence of greywackes with narrow siltstone partings. This formation hosts most significant base metal occurrences known in the Kanmantoo Trough. The Kanmantoo Group as a whole is dominated by siliclastic sediments which were mostly rapidly deposited in a fault - controlled basin (the Kanmantoo Trough) developed in the Early Cambrian on the southeastern side of the late Proterozoic Adelaide basin. During the Late Cambrian - Early Ordovician Delamerian Orogeny, the sediments were deformed and metamorphosed, attaining P-T conditions around the andalusite-sillimanite boundary and probably close to the aluminosilicate triple point (P around 3-4 kb, T around 500-600 degrees C) in the areas examined during the field excursion. During the late seventies and much of the eighties numerous apparently epigenetic mineral deposits and associated alteration zones were recognised as having precursors formed during sedimentation (or diagenesis) of the host rocks. In recent years there has been a reversal of this trend (by no means universal), particularly in relation to certain Cu and Au, but also Pb-Zn-Ag deposits. The role of transport of ore constituents during deformation and metamorphism and their ore-forming potential has been stressed. Large scale transport by metamorphic mineralising fluids along permeability created by deformation (cleavage fabrics), and formation of mineral deposits by emplacement into structural (dilational) or chemical traps, is envisaged.